深源地震折合能量的标度性及其与深度的关系(英文)
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摘要
利用1987年1月至2001年12月的哈佛CMT目录和美国NEIC地震辐射能量目录 ,研究了全球范围内震源深度大于 70km的地震的辐射能量与地震矩之比 (或称折合能量 )随地震矩的变化及其与震源深度之间的关系 .结果表明对震源深度为 70～ 40 0km的地震 ,折合能量随地震矩的增加而降低 ;对于深度大于 40 0km的地震 ,折合能量随地震矩的增加而增加 .这一特征与浅源地震似乎很不相同 .
The ratio of radiated energy over seismic moment, or the so-called reduced energy, is studied for global deep-focus earthquakes deeper than 70km using the scalar seismic moment in the Harvard CMT catalogue and the radiated energy estimated by NEIC from January 1987 to December 2001. The scaling of reduced energy versus seismic moment is obtained for different depth ranges, respectively. It is observed that for earthquakes with depths between 70km and 400km, reduced energy decreases with seismic moment, while for earthquakes with depths beyond 400km, reduced energy increases with seismic moment. This characteristic is apparently different from that of shallow earthquakes.
The ratio of radiated energy over seismic moment, or the so-called reduced energy, is studied for global deep-focus earthquakes deeper than 70km using the scalar seismic moment in the Harvard CMT catalogue and the radiated energy estimated by NEIC from January 1987 to December 2001. The scaling of reduced energy versus seismic moment is obtained for different depth ranges, respectively. It is observed that for earthquakes with depths between 70km and 400km, reduced energy decreases with seismic moment, while for earthquakes with depths beyond 400km, reduced energy increases with seismic moment. This characteristic is apparently different from that of shallow earthquakes.
引文
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[2] WiensDA .Seismologicalconstraintsonthemechanismofdeepearthquakes:temperaturedependenceofdeepearthquakesourceproperties.Phys.EarthPlanet.Interi.,2001,127:145～163
[3] FrohlichC .Thenatureofdeep focusearthquakes.Ann.Rev.EarthPlanet.Sci.,1989,17:227～254
[4] HoustonH .Influenceofdepth,focalmechanism,andtectonicsettingontheshapeanddurationofearthquakesourcetimefunctions.J .Geophys.Res.,2001,106:11137～11150
[5] KanamoriH ,HeatonTH .Microscopicandmacroscopicphysicsofearthquakes.In:RundleJB ,TurcotteDL ,KleinW .GeoComplexityandthePhysicsofEarthquakes.WashingtonDC :AGU ,2000,147～163
[6] WyssM ,BruneJN .Seismicmoment,stress,andsourcedimensionsforearthquakesintheCaliforniaNevadaregion.J .Geophys.Res.,1968,73:4681～4694
[7] McGarrA .Onrelatingapparentstresstothestresscausingearthquakefaultslip.J .Geophys.Res.,1999,104:3003～3011
[8] IdeS ,BerozaGC .Doesapparentstressvarywithearthquakesize?Geophys.Res.Lett.,2001,28:3349～3352
[9] IzutaniY ,KanamoriH .Scale dependenceofseismicenergy to momentratioforstrike slipearthquakesinJapan.Geophys.Res.Lett.,2001,28:4007～4010
[10] WuZL .Scalingofapparentstressfrombroadbandradiatedenergycatalogueandseismicmomentcatalogueanditsfocalmechanismdependence.Earth,PlanetsandSpace,2001,53:943～948
[11] DziewonskiAM ,ChouT A ,WoodhouseJH .Determinationofearthquakesourceparametersfromwaveformdataforstudiesofglobalandregionalseismicity.J .Geophys.Res.,1981,86:2825～2852
[12] BoatwrightJ ,ChoyGL .Teleseismicestimatesoftheenergyradiatedbyshallowearthquakes.J .Geophys.Res.,1986,91:2095～2112
[13] ChoyGL ,BoatwrightJL .Globalpatternsofradiatedseismicenergyandapparentstress.J .Geophys.Res.,1995,100:18205～18288
[14] ChoyGL ,McGarrA .Strike slipearthquakesintheoceaniclithosphere:observationsofexceptionallyhighapparentstress.Geophys.J .Int.,2002,150:506～523
[15] PattonHJ .BiasinthecentroidmomenttensorforcentralAsianearthquakes:Evidencefromregionalsurfacewavedata.J .Geophys.Res.,1998,103:26963～26974
[16] FrohlichC .Trianglediagrams:ternarygraphstodisplaysimilarityanddiversityofearthquakefocalmechanisms.Phys.EarthPlanet.Interi.,1992,75:193～198
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